MathPHP\SetTheory\SetAxiomsTest::testUnionCommutative PHP Метод

    public function testUnionCommutative(Set $A, Set $B)
    {
        $A∪B = $A->union($B);
        $B∪A = $B->union($A);
        $this->assertEquals($A∪B, $B∪A);
        $this->assertEquals($A∪B->asArray(), $B∪A->asArray());
    }